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Design and experimental verification on a deformable underwater solar concentrator with bi‐layer film structure
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-07-06 , DOI: 10.1002/er.5655 Shen Liang 1 , Hongfei Zheng 1 , Dandan Cui 1 , Xinglong Ma 1
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-07-06 , DOI: 10.1002/er.5655 Shen Liang 1 , Hongfei Zheng 1 , Dandan Cui 1 , Xinglong Ma 1
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This paper presents a deformable underwater solar concentrator (DUSC) which is innovatively designed to converge underwater radiation. The concentrator is a hollow cylinder‐like structure with elastic films covering the two flat ends. When it is put underwater, the elastic films will concave inwards and form spherical convex lenses. The design scheme and concentrating peculiarities of the concentrator were analysed. Optical simulation and experimental verification were carried out on a concentrator sample with diameter of 200 mm. It is found that f‐number (the ratio of focal length to radius) and concentration ratio will decrease when enlarge the films' deformation ratio. The effective deformation ratio is found to be less than 0.45 to avoid total reflection. Optical simulation under condition of visible spectrum with considering the solar parallax indicates that the maximum energy density of the focus occurs when deformation ratio is 0.3, and f‐number is around 3.5. During the tilt incidence, the shape of focus and energy density value will not vary distinctly until the tilt incident angle is above 10°. The average experimental optical efficiency of the DUSC is about 60% when incident angle is within 10°. This work is likely to provide a new perspective for utilizing solar energy underwater.
中文翻译：
具有双层薄膜结构的可变形水下聚光器的设计与实验验证
本文介绍了一种可变形的水下太阳能聚光器（DUSC），该聚光器经过创新设计，可以收敛水下辐射。集中器是空心圆柱状结构，其弹性膜覆盖两个扁平端。当将其置于水下时，弹性膜将向内凹入并形成球面凸透镜。分析了选矿厂的设计方案和选矿特点。对直径为200 mm的浓缩器样品进行了光学模拟和实验验证。发现f放大胶片的变形比时，数量（焦距与半径之比）和浓度比将减小。发现有效变形率小于0.45以避免全反射。在考虑太阳视差的情况下，在可见光谱条件下的光学模拟表明，当变形比为0.3且f数约为3.5时，焦点的最大能量密度发生。在倾斜入射期间，焦点的形状和能量密度值不会明显变化，直到倾斜入射角大于10°。当入射角在10°以内时，DUSC的平均实验光学效率约为60％。这项工作可能会为水下利用太阳能提供新的视角。
更新日期：2020-07-06
中文翻译：
具有双层薄膜结构的可变形水下聚光器的设计与实验验证
本文介绍了一种可变形的水下太阳能聚光器（DUSC），该聚光器经过创新设计，可以收敛水下辐射。集中器是空心圆柱状结构，其弹性膜覆盖两个扁平端。当将其置于水下时，弹性膜将向内凹入并形成球面凸透镜。分析了选矿厂的设计方案和选矿特点。对直径为200 mm的浓缩器样品进行了光学模拟和实验验证。发现f放大胶片的变形比时，数量（焦距与半径之比）和浓度比将减小。发现有效变形率小于0.45以避免全反射。在考虑太阳视差的情况下，在可见光谱条件下的光学模拟表明，当变形比为0.3且f数约为3.5时，焦点的最大能量密度发生。在倾斜入射期间，焦点的形状和能量密度值不会明显变化，直到倾斜入射角大于10°。当入射角在10°以内时，DUSC的平均实验光学效率约为60％。这项工作可能会为水下利用太阳能提供新的视角。
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